/**
*      author: Y_Yao
*      created: 2025-03-15 20:02:53
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 9e18;
const int INF = 0x3f3f3f3f;
string s;

void solve()
{
    cin >> s;
    s = " " + s;
    int ans = 0;
    for(int i = 1;i <= s.size() - 1;i++)
    {
        if(i % 2 == 0)
        {
            if(s[i] == 'o') continue;
            s.insert(i - 1,"i");
            ans++;
        }
        else//i
        {
            if(s[i] == 'i') continue;
            s.insert(i - 1,"o");
            ans++;
        }
    }
    if((s.size() - 1) % 2 != 0)
    {
        ans++;
    }
    cout << ans << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}